The NWSA formed in 1869 and dissolved in 1890 so therefore the answer would be a.1800s
They were shocked because the Mexican Military had more weapons than them and had more forces too.
After the civil war, much of the ownership for land was unattainable for free slaves due to the government opposing the idea. Instead most African slaves had to become sharecroppers on plantations where they had previously been slaves.
Answer:
Britain, France, and the soviet union agreed to contain Hitler's power in Europe.